JPH086809B2 - gasket - Google Patents
gasketInfo
- Publication number
- JPH086809B2 JPH086809B2 JP63204961A JP20496188A JPH086809B2 JP H086809 B2 JPH086809 B2 JP H086809B2 JP 63204961 A JP63204961 A JP 63204961A JP 20496188 A JP20496188 A JP 20496188A JP H086809 B2 JPH086809 B2 JP H086809B2
- Authority
- JP
- Japan
- Prior art keywords
- gasket
- expanded graphite
- metal foil
- thickness
- silicon resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Gasket Seals (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はガスケットに係り、特に封止特性を低下させ
ることなく防食性および取扱い性を向上させたガスケッ
トに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket, and more particularly to a gasket having improved corrosion resistance and handleability without deteriorating sealing characteristics.
（従来の技術） 膨張黒鉛は、封止性，耐熱性，耐薬品性（耐食性）お
よび耐久性等にすぐれた特性を有しているため、例えば
フランジ管継手における継手面の流体漏れを防ぐガスケ
ットとして多用されている。(Prior Art) Expanded graphite has excellent properties such as sealing property, heat resistance, chemical resistance (corrosion resistance), and durability, so that, for example, a gasket that prevents fluid leakage from the joint surface of a flange pipe joint. Is often used as.
（発明が解決しようとする課題） ところで、膨張黒鉛は、一般に、天然黒鉛などを濃硫
酸と、強酸化材の混合液で処理して黒鉛層間化合物を形
成させ、これを急激に加熱，発泡させて黒鉛粒子を高度
に膨張させることによって得られる。そして、この膨張
黒鉛をロール或いは型押しによってシート状に加工し
た、所謂、膨張黒鉛シートを用いてガスケットを成形し
ている。(Problems to be solved by the invention) In general, expanded graphite is formed by treating natural graphite or the like with a mixed solution of concentrated sulfuric acid and a strong oxidant to form a graphite intercalation compound, which is rapidly heated and foamed. It is obtained by highly expanding graphite particles. Then, a gasket is formed using a so-called expanded graphite sheet obtained by processing the expanded graphite into a sheet shape by roll or embossing.
膨張黒鉛によって成形されたガスケットは、前述のよ
うに、封止性，耐熱性，耐薬品性（耐食性）および耐久
性等にすぐれた特性を有しているため、管継手における
継手面の流体漏れを防ぐ密封部材として好適に仕様でき
る利点を有しているものの、黒鉛層間化合物（酸性化合
物）が若干残存しているから、これを管継手に用いた場
合、前記化合物によって継手面、つまりガスケットを挾
着するフランジ面を腐食させ、経時的に封止特性を低下
させる欠点がある。As described above, the gasket formed of expanded graphite has excellent sealing properties, heat resistance, chemical resistance (corrosion resistance), durability, etc. Although it has the advantage that it can be suitably used as a sealing member that prevents the occurrence of graphite intercalation compounds (acidic compounds), some of them remain in the pipe joint. It has a drawback that it corrodes the clinging flange surface and deteriorates the sealing characteristics over time.
また、膨張黒鉛シートは、端なる膨張黒鉛粒子の絡み
合いによって形成されているものであるから、靭性が低
く軟質で脆いため強度的に若干の問題を有している。そ
のために取扱いにおいて折損および瑕疵等が発生し易
い。しかも粘着力が高いために継手面に固着し易く、し
たがって保守点検等に際して継手を分解してもガスケッ
トの除去が困難であり、形態を損ないやすく、再使用す
ることができない等の欠点を有している。Further, since the expanded graphite sheet is formed by the entanglement of the expanded graphite particles at the ends, the expanded graphite sheet has a low toughness, is soft and brittle, and has some problems in strength. Therefore, breakage and defects are likely to occur during handling. Moreover, since the adhesive strength is high, it easily sticks to the joint surface, so even if the joint is disassembled for maintenance and inspection, it is difficult to remove the gasket, the shape is easily damaged, and it cannot be reused. ing.
本発明は上記のような実情に鑑みてなされたもので、
膨張黒鉛が元来保有する耐熱性、封止性、耐薬品性等の
特性を低下させることなく、相手側継手面に対する防食
性および補強機能、表面保護性能の向上を図ることがで
きるとともに、適用温度のいかんにかかわらず相手側継
手面に対して優れた離型性能を付与して取扱い性の著し
い向上を図ることができ、しかも締付け時にその全域に
亘って均一な封止性能を発揮させることができるガスケ
ットを提供することを目的としている。The present invention has been made in view of the above circumstances,
Expanded graphite can improve corrosion resistance, mating function, and surface protection of the mating joint surface without deteriorating the properties such as heat resistance, sealing property, and chemical resistance originally possessed by expanded graphite. Regardless of the temperature, excellent mold release performance can be imparted to the mating surface of the mating side to significantly improve handleability, and moreover, uniform sealing performance can be achieved over the entire area during tightening. The purpose is to provide a gasket that can.
（問題点を解決するための手段） 上記目的を達成するために、本発明に係るガスケット
は、厚さ方向の中央部に金属箔を配置した膨張黒鉛ガス
ケット基体の表面に、厚さ５〜20μｍのシリコン樹脂系
被膜を形成したものである。(Means for Solving the Problems) In order to achieve the above object, the gasket according to the present invention has a thickness of 5 to 20 μm on the surface of an expanded graphite gasket substrate in which a metal foil is arranged at the center in the thickness direction. The above-mentioned silicone resin coating is formed.
（作用） 本発明によれば、膨張黒鉛ガスケット基体の表面を厚
さ５〜20μｍのシリコン樹脂系被膜で覆わせることによ
り、膨張黒鉛が元来保有している耐熱性、封止性、耐薬
品性等の特性を適用温度にいかんにかかわらず保持させ
ながら、膨張黒鉛ガスケット基体中の黒鉛層間化合物が
相手側継手面に浸透することによる継手面の腐食を防止
する防食性能を達成するだけでなく、上記シリコン樹脂
系被膜および厚さ方向中央部に配置された金属箔による
補強効果の相乗作用によってガスケット全体の強度を増
大して折損等の発生を防止するとともに、シリコン樹脂
系被膜による表面保護性能によって瑕疵の発生も防止し
て、取扱い性の向上を達成することができ、さらに、膨
張黒鉛ガスケット基体の表面が相手側継手面に付着する
ことを防ぐ優れた離型性能も付与することができる。ま
た、厚さ方向の中央部に配置された金属箔の存在によっ
て、ガスケット全体として均一な材料密度にする作用を
生起させて、締付け時にその全域に亘って均一な封止性
能を発揮させることができる。(Function) According to the present invention, by covering the surface of the expanded graphite gasket substrate with a silicon resin-based coating having a thickness of 5 to 20 μm, the expanded graphite originally has heat resistance, sealing property and chemical resistance. In addition to achieving corrosion prevention performance that prevents corrosion of the joint surface due to the intercalation of the graphite intercalation compound in the expanded graphite gasket substrate into the mating joint surface while maintaining properties such as properties regardless of the application temperature. , The strength of the gasket as a whole is increased by the synergistic effect of the reinforcing effect of the above-mentioned silicon resin-based coating and the metal foil arranged in the central portion in the thickness direction to prevent the occurrence of breakage, and the surface protection performance of the silicon resin-based coating It also prevents the occurrence of defects and improves the handling, and also prevents the surface of the expanded graphite gasket substrate from adhering to the mating joint surface. Releasing performance was also can be imparted. In addition, the presence of the metal foil arranged in the central portion in the thickness direction causes an effect of making the material density uniform in the entire gasket, and it is possible to exhibit uniform sealing performance over the entire area when tightening. it can.
（実施例） 以下、本発明の実施例を図面に基いて説明する。(Example) Hereinafter, the Example of this invention is described based on drawing.
第１図は本発明の一実施例である丸形環状ガスケット
の正面図、第２図は第１図におけるII−II線に沿う拡大
断面図であり、これらの図において、ガスケット１は厚
さ方向中央部に金属箔２を配置し、この金属箔２の上面
に接着材3Aを介して膨張黒鉛ガスケット基体4Aを接着
し、該膨張黒鉛ガスケット基体4Aの表面（上面）にシリ
コン樹脂系被膜５を形成するとともに、前記金属箔２の
下面に接着材3Bを介して膨張黒鉛ガスケット基体4Bを接
着し、該膨張黒鉛ガスケット基体4Bの表面（下面）にシ
リコン樹脂系被膜５を形成した構成になっている。FIG. 1 is a front view of a round annular gasket which is an embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along the line II-II in FIG. 1. In these drawings, the gasket 1 has a thickness. The metal foil 2 is arranged at the center in the direction, and the expanded graphite gasket substrate 4A is adhered to the upper surface of the metal foil 2 via the adhesive 3A, and the silicon resin coating 5 is formed on the surface (upper surface) of the expanded graphite gasket substrate 4A. And the expanded graphite gasket substrate 4B is adhered to the lower surface of the metal foil 2 via the adhesive 3B, and the silicon resin coating 5 is formed on the surface (lower surface) of the expanded graphite gasket substrate 4B. ing.
金属箔２は厚さ50μｍのステンレス（例えばSUS316）
を環状に剪断したものが好ましく、接着材3A,3Bとして
は、例えば熱硬化性のフェノール樹脂系のものが好まし
い。そして厚さ７μｍで塗布している。膨張黒鉛ガスケ
ット基体4A,4Bは厚さ1mm、密度0.9〜1.1g/cm3の膨張黒
鉛シートを環状に専断したものを用いている。また、シ
リコン樹脂系被膜５は、シリコン樹脂系ワニス（例えば
信越化学（株）製のKR−251）を用いており、ガスケッ
ト基体4A,4Bの表面に厚さ５μｍ〜20μｍとなるように
刷毛によって塗布したのち、室温80℃の乾燥室内で２〜
15分間乾燥することによって形成している。The metal foil 2 is made of stainless steel with a thickness of 50 μm (eg SUS316).
Are preferably sheared in a ring shape, and as the adhesives 3A and 3B, for example, thermosetting phenol resin-based adhesives are preferable. And it is applied with a thickness of 7 μm. The expanded graphite gasket substrates 4A and 4B are formed by annularly cutting an expanded graphite sheet having a thickness of 1 mm and a density of 0.9 to 1.1 g / cm 3 . The silicone resin coating 5 is made of silicone resin varnish (for example, KR-251 manufactured by Shin-Etsu Chemical Co., Ltd.) and is brushed on the surfaces of the gasket bases 4A and 4B with a thickness of 5 μm to 20 μm. After coating, 2 to 2 in a drying room at room temperature 80 ℃
It is formed by drying for 15 minutes.
前記構成のガスケット１においては、金属箔２の補強
効果によって剛性が高められ、全体強度が増大する。そ
のために特にガスケット１の折損を防止できるので取扱
い性が向上する。また、接着剤3A,3Bとして熱硬化性の
フェノール系樹脂を用いているので、耐熱性は勿論のこ
と、耐溶剤性にすぐれた特性を発揮して強力な結合力を
得ることができる。In the gasket 1 having the above structure, the rigidity is increased by the reinforcing effect of the metal foil 2, and the overall strength is increased. Therefore, the breakage of the gasket 1 can be particularly prevented, and the handleability is improved. Further, since the thermosetting phenolic resin is used as the adhesives 3A and 3B, not only the heat resistance but also the solvent resistance is exhibited, and a strong bonding force can be obtained.
膨張黒鉛ガスケット基体4A,4Bによってガスケット１
が要求される高い封止特性を十分に確保できる。これら
ガスケット基体4A,4Bには、周知のように、濃硫酸と強
酸化材との混合液で処理した場合に形成される黒鉛層間
混合物が残存しているけれども、膨張黒鉛ガスケット基
体4A,4Bそれぞれの表面に形成したシリコン樹脂系被膜
５によって、前記黒鉛層間化合物による悪影響を確実に
回避することができる。Expanded graphite gasket base 4A, 4B gasket 1
It is possible to sufficiently secure the high sealing characteristics required. As is well known, these gasket bases 4A and 4B retain the graphite intercalation mixture formed when treated with a mixed solution of concentrated sulfuric acid and a strong oxidizer, but the expanded graphite gasket bases 4A and 4B respectively. The adverse effect of the graphite intercalation compound can be reliably avoided by the silicon resin coating 5 formed on the surface of the.
即ち、本実施例に係るガスケット１を、例えば周知の
フランジ管継手の流体漏れを防ぐ密封部材として使用し
た場合、フランジ管継手における継手面、つまりガスケ
ット１を挾着する金属製のフランジ面には、シリコン樹
脂系被膜５が圧接することになり、黒鉛層間化合物がフ
ランジ面に浸透しないので、黒鉛層間化合物によってフ
ランジ面が腐食される不都合を防止できる。そのため
に、経時的に封止特性が低下するようなことがない。That is, when the gasket 1 according to the present embodiment is used as, for example, a sealing member that prevents fluid leakage of a well-known flange pipe joint, the joint surface of the flange pipe joint, that is, the metal flange face to which the gasket 1 is attached is Since the silicon resin coating 5 is pressed into contact with the graphite intercalation compound and does not penetrate into the flange surface, it is possible to prevent the inconvenience that the graphite intercalation compound corrodes the flange surface. Therefore, the sealing characteristics do not deteriorate with time.
また、シリコン樹脂系被膜５の厚さを５〜20μｍの範
囲に特定することにより、膨張黒鉛ガスケット基体4A,4
Bが元来保有している耐熱性、耐薬品性などの優れた封
止特性を適用温度にいかんにかかわらず保持させなが
ら、これら膨張黒鉛ガスケット基体4A,4Bよりも硬質か
つ高強度なシリコン樹脂系被膜５による補強効果と厚さ
方向の中央部に配置された金属箔２による補強効果とが
相俟って、ガスケット１の全体強度を高めて取扱い時の
折損等を防止するとともに、シリコン樹脂系被膜５によ
る表面保護機能により瑕疵等の発生を防止することがで
きて、取扱い性の向上を図ることができる。さらに、膨
張黒鉛ガスケット基体4A,4Bの表面が相手側継手面（フ
ランジ面）に付着することを避けて、保守点検等に際し
て継手を分解したとき、ガスケット１をその形態を損な
わないで継手面から容易に離型させて、再使用を可能と
することができる。さらにまた、厚さ方向の中央部に配
置された金属箔２の存在によって、ガスケット１全体と
して均一な材料密度にする作用が生起されて、締付け時
にその全域に亘って均一な封止性能を発揮させることが
できる。Further, by specifying the thickness of the silicon resin coating 5 in the range of 5 to 20 μm, the expanded graphite gasket bases 4A, 4
Silicon resin that is harder and has higher strength than these expanded graphite gasket bases 4A and 4B while retaining the excellent sealing properties that B originally possesses, such as heat resistance and chemical resistance, regardless of the application temperature. The reinforcing effect of the system coating 5 and the reinforcing effect of the metal foil 2 arranged in the central portion in the thickness direction are combined to enhance the overall strength of the gasket 1 to prevent breakage during handling, and to improve the silicone resin. Due to the surface protection function of the system coating 5, it is possible to prevent the occurrence of defects and the like, and it is possible to improve the handleability. Furthermore, avoiding the surfaces of the expanded graphite gasket base bodies 4A and 4B from adhering to the mating joint surface (flange surface), and when disassembling the joint during maintenance and inspection, the gasket 1 is removed from the joint surface without impairing its shape. It can be easily released and can be reused. Furthermore, the presence of the metal foil 2 arranged in the central portion in the thickness direction causes an action of making the material density uniform in the gasket 1 as a whole, and exhibits uniform sealing performance over the entire area when tightening. Can be made.
（実験例） 膨張黒鉛シート（UCC社製GTB,厚さ0.38mm×縦50mm×
横50mm）の表面（上下両面）にシリコン系樹脂被膜（信
越化学（株）製KR−251）を刷毛によって塗布（塗量6.6
×10-4g/cm2）し、自然乾燥後22時間かけて150℃まで加
熱乾燥する。(Experimental example) Expanded graphite sheet (GTB manufactured by UCC, thickness 0.38 mm × length 50 mm ×
Silicone resin coating (KR-251 manufactured by Shin-Etsu Chemical Co., Ltd.) is applied to the surface (width 50 mm) (both upper and lower sides) by brush (coating amount 6.6
X 10 -4 g / cm 2 ), air dry and heat dry to 150 ° C over 22 hours.
前記で得たシートによって、外径42mm×内径25mmの
ガスケットを製作する。A gasket having an outer diameter of 42 mm and an inner diameter of 25 mm is manufactured using the sheet obtained above.
SUS,403（焼入れ、焼戻し品）、表面粗さRma×15（μ
ｍ）のフランジによって30KGf/cm2の締付条件で前記
のガスケットを締付ける。SUS, 403 (Quenched and tempered products), Surface roughness Rma x 15 (μ
Tighten the above gasket under the tightening condition of 30KGf / cm 2 with the flange of m).
蒸留水中に10分間浸漬したのち、室温にて72時間放置
する。After soaking in distilled water for 10 minutes, leave at room temperature for 72 hours.
前記〜の条件に基いて腐食試験を行った結果、フ
ランジ面に腐食が起らないすぐれた防食性と、フランジ
面への付着が起らない非固着性を、それぞれ併有してい
ることが確認できた。As a result of performing a corrosion test based on the conditions (1) to (3), it has both excellent corrosion resistance that does not cause corrosion on the flange surface and non-sticking property that does not cause adhesion to the flange surface. It could be confirmed.
（発明の効果） 以上のように、本発明によれば、厚さ方向の中央部に
金属箔を配置した膨張黒鉛ガスケット基体の表面を厚さ
５〜20μｍのシリコン樹脂系被膜で覆わせた構成として
いるので、膨張黒鉛が元来保有している耐熱性、封止
性、耐薬品性等の特性を適用温度のいかんにかかわらず
保持させて優れた封止性能を確保しながら、膨張黒鉛ガ
スケット基体中の黒鉛層間化合物による相手側継手面の
腐食を防止する防食性能を発揮させることができるだけ
でなく、上記シリコン樹脂系被膜および金属箔の補強効
果の相乗作用によってガスケット全体の強度を増大して
折損等の発生を防止するとともに、シリコン樹脂系被膜
による表面保護性能によって瑕疵の発生も防止して、ガ
スケットの取扱い性を著しく向上することができ、か
つ、膨張黒鉛ガスケット基体の表面が相手側継手面に付
着することを防ぐ優れた離型性能も付与してガスケット
に再使用性をもたせることができる。しかも、厚さ方向
の中央部に配置された金属箔の存在によって、ガスケッ
ト全体として均一な材料密度にする作用を生起させて、
締付け時にその全域に亘って均一な封止性能を発揮させ
ることができるといった効果を奏する。(Effect of the Invention) As described above, according to the present invention, the surface of the expanded graphite gasket substrate having the metal foil arranged in the central portion in the thickness direction is covered with the silicon resin film having a thickness of 5 to 20 μm. As a result, the expanded graphite gasket retains its inherent properties such as heat resistance, sealing property, and chemical resistance regardless of the application temperature, while ensuring excellent sealing performance. Not only can the anticorrosion performance to prevent the corrosion of the mating joint surface due to the graphite intercalation compound in the base material be exerted, but also the strength of the entire gasket can be increased by the synergistic effect of the reinforcing effect of the silicon resin coating and the metal foil. In addition to preventing breakage and the like, the surface protection of the silicone resin coating also prevents the occurrence of defects, which can significantly improve the handling of the gasket, and expand the gasket. Surface of the lead gasket substrate can impart a reuse excellent in releasing performance by applying gaskets prevent from adhering to the mating joint surfaces. Moreover, the presence of the metal foil arranged in the central portion in the thickness direction causes an effect of making the material density uniform in the entire gasket,
An effect that uniform sealing performance can be exerted over the entire region when tightened.
第１図は本発明の一実施例を示す正面図、第２図は第１
図におけるII−II線に沿う拡大断面図である。 １……ガスケット 4A,4B……ガスケット基体 ５……シリコン樹脂系被膜FIG. 1 is a front view showing an embodiment of the present invention, and FIG.
It is an expanded sectional view which follows the II-II line in a figure. 1 ... Gasket 4A, 4B ... Gasket base 5 ... Silicon resin coating
Claims (1)
黒鉛ガスケット基体の表面に、厚さ５〜20μｍのシリコ
ン樹脂系被膜を形成していることを特徴とするガスケッ
ト。1. A gasket characterized in that a silicon resin-based coating having a thickness of 5 to 20 μm is formed on the surface of an expanded graphite gasket substrate having a metal foil arranged at the center in the thickness direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63204961A JPH086809B2 (en) | 1988-08-18 | 1988-08-18 | gasket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63204961A JPH086809B2 (en) | 1988-08-18 | 1988-08-18 | gasket |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0257764A JPH0257764A (en) | 1990-02-27 |
| JPH086809B2 true JPH086809B2 (en) | 1996-01-29 |
Family
ID=16499172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63204961A Expired - Lifetime JPH086809B2 (en) | 1988-08-18 | 1988-08-18 | gasket |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH086809B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102239888B1 (en) * | 2020-12-24 | 2021-04-12 | 이의정 | The metal gasket and manufacturing method having anti-corrosion layer |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5024863A (en) * | 1990-02-02 | 1991-06-18 | Jmk International, Inc. | Engine gasket with oil impermeable surface |
| JP3028171B2 (en) * | 1993-08-31 | 2000-04-04 | 日本ピラー工業株式会社 | Composite gasket |
| JP3836172B2 (en) * | 1995-05-26 | 2006-10-18 | 日本バルカー工業株式会社 | Joint sheet |
| DE19804289A1 (en) * | 1998-02-04 | 1999-08-05 | Sgl Technik Gmbh | Laminate gasket with flare |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2128270B (en) * | 1982-10-01 | 1986-01-22 | T & N Materials Res Ltd | Making gaskets from exfoliated graphite |
| JP2788929B2 (en) * | 1986-09-12 | 1998-08-20 | 日本ラインツ株式会社 | Gasket |
-
1988
- 1988-08-18 JP JP63204961A patent/JPH086809B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102239888B1 (en) * | 2020-12-24 | 2021-04-12 | 이의정 | The metal gasket and manufacturing method having anti-corrosion layer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0257764A (en) | 1990-02-27 |
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